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Question
Circle the correct subtraction fact (by using casting out nine).
3264 − 1063 = 2200
Solution
3264 − 1063 = 2200
3264 − 1063 = 2200
6 − 1 = 4
6 = 4 + 1
6 = 5
The subtraction is not correct.
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A city is planned in such a way that every 5 km has a circle and has 4 signals around.
So, can you guess where the signals and circle are there?
How many signals are needed for a 20 km distance?
Look at the calendar below.
Let us mark 3 × 3 boxes (9 dates) on the calendar and see some magic.
| Take the smallest number | 3 |
| Add 8 to it | +8 |
| = | 11 |
| Multiply it by 9 | ×9 |
| Total | 99 |
Now you choose any 3 × 3 boxes from a calendar and find the total in the same way.
Now make your own number surprises.
